%0 Journal Article
%T A broad deglacial δ 13C minimum event in planktonic foraminiferal records in the Okinawa Trough
%A LI Tiegang
%A LIU Zhenxia
%A M A Hall
%A Y Saito
%A S Berne
%A CANG Shuxi
%A CHENG Zhenbo
%A
%J 科学通报(英文版)
%D 2002
%I
%X The equatorial Pacific upwelling zone has been suspected of playing an important role in the global atmospheric CO2 changes associated with glacial-interglacial cycles. In order to assess the influencing scope of the surface water deglacial δ 13C minimum in the tropical low-latitude Pacific, the core DGKS9603, collected from the middle Okinawa Trough, was examined for δ 13C records of planktonic foraminifera N. dutertrei and G. ruber. The planktonic foraminiferal δ 13C records show a clear decreasing event from 20 to 6 cal. kaBP., which is characterized by long duration of about 14 ka and amplitude shift of 0.4 × 10-3. Its minimum value occurred at 15.7 cal kaBP. The event shows fairly synchrony with the surface water deglacial δ 13C minimum identified in the tropical Pacific and its marginal seas. Because there is no evidence in planktonic foraminiferal fauna and δ 18O records for upwelling and river runoff enhancement, the broad deglacial δ 13C minimum event in planktonic foraminiferal records revealed in core DGKS9603 might have been the direct influencing result of the deglacial surface water of the tropical Pacific. The identification for the event in the Okinawa Trough provides new evidence that the water evolution in the tropical low-latitude Pacific plays a key role in large regional, even global carbon cycle.
%K minimum event
%K Okinawa Trough
%K last deglaciation
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=01BA20E8BA813E1908F3698710BBFEFEE816345F465FEBA5&cid=96E6E851B5104576C2DD9FC1FBCB69EF&jid=DD6615BC9D2CFCE0B6F945E8D5314523&aid=2162B7324E6E0648222B69843015C325&yid=C3ACC247184A22C1&vid=F4B561950EE1D31A&iid=DF92D298D3FF1E6E&sid=4158386E7B9422C8&eid=70E3F4DEB0172F14&journal_id=1001-6538&journal_name=科学通报(英文版)&referenced_num=0&reference_num=0